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Anonymous Poster #1

GI Pipe Welding

09/17/2015 2:31 AM

One of my client not accepting the GI pipe welding. is there any good reason for that ? or can we weld the GI pipe

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#1

Re: GI PIPE WELDING

09/17/2015 2:43 AM

Can anyone advice on my request

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#2
In reply to #1

Re: GI PIPE WELDING

09/17/2015 3:15 AM

How about: Please?

How about more information about pipe material and purpose of the pipe?

Are they rejecting the idea of welding in general or only the quality of the welds?

If the first what are they proposing to join the pipe?

If the second then you might have to improve your welding quality.

If in doubt the customer is right.

If in doubt the customer gets what he wants.

If in doubt the customer might have to do it twice.

If you are lucky you don't have to pay the price.

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#4
In reply to #2

Re: GI PIPE WELDING

09/17/2015 4:16 AM

See

The piping materials is Galvanised carbon steel.

Yes they are rejecting the idea of welding. The reason is that the pipe internal may get damaged the Galvanize due to welding heat.

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#10
In reply to #4

Re: GI PIPE WELDING

09/17/2015 4:49 AM

Well, that's your answer, then.

So far you've said nothing about what is in the pipe nor what size it is. Pretty fundamental in my book!

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#3

Re: GI PIPE WELDING

09/17/2015 3:24 AM

Have your customer contact the forum directly.

I do not trust you to properly convey the message to them.

If you do not know why GI pipe welding in not advisable, stop cheating your client and quit your job today.

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#5
In reply to #3

Re: GI PIPE WELDING

09/17/2015 4:19 AM

Hellow

Its my questing. if you know please answer ,if not shut off.

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#7
In reply to #5

Re: GI PIPE WELDING

09/17/2015 4:46 AM

Hi Mani,

I believe, Lyn responded in the way he did (does) is, it beggars belief the question is asked in the first place.

You said "you have a client", this generally means "he" is reliant on your expertise. To come to an anonymous forum and ask such a naive question rings alarm bells as to your abilities.

To weld a Galvanised pipe, the coating needs to be removed from the outside and the heat of welding will burn the galvanising off the inside leaving no protection so, your client has a valid concern.

I'm sure other members can quote you chapter and verse on the technicalities of welding the material in question.

John

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#8
In reply to #5

Re: GI PIPE WELDING

09/17/2015 4:46 AM

No Please!

No manners!

I doubt anybody will help you here!

Now I think it is your problem!

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#9
In reply to #5

Re: GI PIPE WELDING

09/17/2015 4:47 AM

How rude!

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#6

Re: GI PIPE WELDING

09/17/2015 4:39 AM

For goodness' sake. This is about the fourth time this topic has come up. I'm reporting this thread as a duplicate.

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#11

Re: GI PIPE WELDING

09/18/2015 2:50 AM

yancheng laiyuan electric equipment co. ltd supply industrial heater for welding and moulding,

www.laiyuan-china.com

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#12

Re: GI PIPE WELDING

09/18/2015 5:44 AM

Some times it may be necessary to weld hot dip galvanized pipes or components. i.e Pipes/components to large to galvanized or to difficult to handle and transport operations. In this cases welding after galvanized is necessary.

All welding process on galvanized steel destroy the zinc coating and , off course , damage the adjacent coating to the weld. This protective coating must be restored after welding operation is complete (including NDT if are required). This activity should be carried according to:

BS 729-1971 or/and EN 1029 (EN 21461)

The use of zinc rich paints is a normal practice to restore the damage coating after weld.

You can remove around 12mm from either side of the intented weld and on both sides of the pipe/component.

The essential variables for welding galvanized steel are the same of those used for the ungalvanized steel.

Precaution with the zinc oxide slag inclusions in the root/hot pass shall be taken.

Remember, good ventilation is require to avoid zinc oxide fumes.

WP

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Users who posted comments:

Crabtree (3); IdeaSmith (2); jesw55 (1); laiyuan-heater (1); lyn (1); Mani Murugesan (3); Whitephone (1)

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